package org.takinframework.core.util;

import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.commons.beanutils.ConvertUtilsBean;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaProperty;
import org.apache.commons.beanutils.PropertyUtilsBean;
import org.apache.commons.beanutils.converters.DateConverter;
import org.apache.commons.beanutils.converters.LongConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.context.ContextLoader;

import com.google.common.collect.Lists;

public class BeanUtils {
	private static Logger logger = LoggerFactory.getLogger(BeanUtils.class);

	public static ConvertUtilsBean convertUtilsBean = new ConvertUtilsBean();

	private static BeanUtilsBean beanUtilsBean = new BeanUtilsBean(
			convertUtilsBean, new PropertyUtilsBean());

	static {
		convertUtilsBean.register(new DateConverter(), Date.class);
		convertUtilsBean.register(new LongConverter(null), Long.class);
	}

	@SuppressWarnings("unused")
	public static boolean isEmpty(Object o) {
		if (o == null)
			return true;
		if ((o instanceof String)) {
			if (((String) o).trim().length() == 0) {
				return true;
			}
		} else if ((o instanceof Collection)) {
			if (((Collection<?>) o).isEmpty()) {
				return true;
			}
		} else if (o.getClass().isArray()) {
			if (((Object[]) o).length == 0) {
				return true;
			}
		} else if ((o instanceof Map)) {
			if (((Map<?, ?>) o).isEmpty()) {
				return true;
			}
		} else if ((o instanceof Long)) {
			if ((Long) o == null) {
				return true;
			}
		} else if ((o instanceof Short)) {
			if ((Short) o == null) {
				return true;
			}
		} else {
			return false;
		}
		return false;
	}

	public static boolean isNotEmpty(Object o) {
		return !isEmpty(o);
	}

	public static boolean isNotEmpty(Long o) {
		return !isEmpty(o);
	}

	public static boolean isNumber(Object o) {
		if (o == null)
			return false;
		if ((o instanceof Number)) {
			return true;
		}
		if ((o instanceof String)) {
			try {
				Double.parseDouble((String) o);
				return true;
			} catch (NumberFormatException e) {
				return false;
			}
		}
		return false;
	}

	public static Object populateEntity(Map<String, ?> map, Object entity)
			throws IllegalAccessException, InvocationTargetException {
		beanUtilsBean.populate(entity, map);
		return entity;
	}

	public static boolean validClass(String className) {
		try {
			Class.forName(className);
			return true;
		} catch (ClassNotFoundException e) {
		}
		return false;
	}

	public static boolean isInherit(Class<?> cls, Class<?> parentClass) {
		return parentClass.isAssignableFrom(cls);
	}

	public static Object cloneBean(Object bean) {
		try {
			return beanUtilsBean.cloneBean(bean);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static Object getBean(Class<?> cls) {
		ApplicationContext ctx = ContextLoader
				.getCurrentWebApplicationContext();

		return ctx.getBean(cls);
	}

	public static List<String> scanPackages(String basePackages)
			throws IllegalArgumentException {
		ResourcePatternResolver rl = new PathMatchingResourcePatternResolver();
		MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(
				rl);
		List<String> result = Lists.newArrayList();
		String[] arrayPackages = basePackages.split(",");
		try {
			for (int j = 0; j < arrayPackages.length; j++) {
				String packageToScan = arrayPackages[j];
				String packagePart = packageToScan.replace('.', '/');
				String classPattern = "classpath*:/" + packagePart
						+ "/**/*.class";
				Resource[] resources = rl.getResources(classPattern);
				for (int i = 0; i < resources.length; i++) {
					Resource resource = resources[i];
					MetadataReader metadataReader = metadataReaderFactory
							.getMetadataReader(resource);
					String className = metadataReader.getClassMetadata()
							.getClassName();
					result.add(className);
				}
			}
		} catch (Exception e) {
			new IllegalArgumentException("scan pakcage class error,pakcages:"
					+ basePackages);
		}

		return result;
	}

	@SuppressWarnings("rawtypes")
	public static void copyNotNullProperties(Object dest, Object orig) {
		if (dest == null) {
			logger.error("No destination bean specified");
			return;
		}
		if (orig == null) {
			logger.error("No origin bean specified");
			return;
		}

		try {
			if ((orig instanceof DynaBean)) {
				DynaProperty[] origDescriptors = ((DynaBean) orig)
						.getDynaClass().getDynaProperties();
				for (int i = 0; i < origDescriptors.length; i++) {
					String name = origDescriptors[i].getName();
					if ((!beanUtilsBean.getPropertyUtils().isReadable(orig,
							name))
							|| (!beanUtilsBean.getPropertyUtils().isWriteable(
									dest, name)))
						continue;
					Object value = ((DynaBean) orig).get(name);
					beanUtilsBean.copyProperty(dest, name, value);
				}
			} else if ((orig instanceof Map)) {
				Iterator<?> entries = ((Map<?, ?>) orig).entrySet().iterator();
				while (entries.hasNext()) {
					Map.Entry entry = (Map.Entry) entries.next();
					String name = (String) entry.getKey();
					if (beanUtilsBean.getPropertyUtils()
							.isWriteable(dest, name))
						beanUtilsBean
								.copyProperty(dest, name, entry.getValue());
				}
			} else {
				PropertyDescriptor[] origDescriptors = beanUtilsBean
						.getPropertyUtils().getPropertyDescriptors(orig);
				for (int i = 0; i < origDescriptors.length; i++) {
					String name = origDescriptors[i].getName();
					if ("class".equals(name)) {
						continue;
					}
					if ((!beanUtilsBean.getPropertyUtils().isReadable(orig,
							name))
							|| (!beanUtilsBean.getPropertyUtils().isWriteable(
									dest, name)))
						continue;
					try {
						Object value = beanUtilsBean.getPropertyUtils()
								.getSimpleProperty(orig, name);
						if (value != null)
							beanUtilsBean.copyProperty(dest, name, value);
					} catch (NoSuchMethodException e) {
						e.printStackTrace();
					}
				}
			}
		} catch (Exception ex) {
			handleReflectionException(ex);
		}
	}

	@SuppressWarnings("unchecked")
	public static <T> T copyProperties(Class<T> destClass, Object orig) {
		Object target = null;
		try {
			target = destClass.newInstance();
			copyProperties(target, orig);
			return (T) target;
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static void copyProperties(Object dest, Object orig) {
		try {
			beanUtilsBean.copyProperties(dest, orig);
		} catch (Exception e) {
			handleReflectionException(e);
		}
	}

	public static void copyProperty(Object bean, String name, Object value) {
		try {
			beanUtilsBean.copyProperty(bean, name, value);
		} catch (Exception e) {
			handleReflectionException(e);
		}
	}

	public static Map<?, ?> describe(Object bean) {
		try {
			return beanUtilsBean.describe(bean);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static String[] getArrayProperty(Object bean, String name) {
		try {
			return beanUtilsBean.getArrayProperty(bean, name);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static ConvertUtilsBean getConvertUtils() {
		return beanUtilsBean.getConvertUtils();
	}

	public static String getIndexedProperty(Object bean, String name, int index) {
		try {
			return beanUtilsBean.getIndexedProperty(bean, name, index);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static String getIndexedProperty(Object bean, String name) {
		try {
			return beanUtilsBean.getIndexedProperty(bean, name);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static String getMappedProperty(Object bean, String name, String key) {
		try {
			return beanUtilsBean.getMappedProperty(bean, name, key);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static String getMappedProperty(Object bean, String name) {
		try {
			return beanUtilsBean.getMappedProperty(bean, name);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static String getNestedProperty(Object bean, String name) {
		try {
			return beanUtilsBean.getNestedProperty(bean, name);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static String getProperty(Object bean, String name) {
		try {
			return beanUtilsBean.getProperty(bean, name);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static PropertyUtilsBean getPropertyUtils() {
		try {
			return beanUtilsBean.getPropertyUtils();
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static String getSimpleProperty(Object bean, String name) {
		try {
			return beanUtilsBean.getSimpleProperty(bean, name);
		} catch (Exception e) {
			handleReflectionException(e);
		}
		return null;
	}

	public static void populate(Object bean, Map<String, ?> properties) {
		try {
			beanUtilsBean.populate(bean, properties);
		} catch (Exception e) {
			handleReflectionException(e);
		}
	}

	public static void setProperty(Object bean, String name, Object value) {
		try {
			beanUtilsBean.setProperty(bean, name, value);
		} catch (Exception e) {
			handleReflectionException(e);
		}
	}

	private static void handleReflectionException(Exception e) {
		ReflectionUtils.handleReflectionException(e);
	}
}
